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8049421: G1 Class Unloading after completing a concurrent mark cycle

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Co-authored-by: Mikael Gerdin <mikael.gerdin@oracle.com>
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
This commit is contained in:
Stefan Karlsson 2014-07-07 10:12:40 +02:00
parent ef1e9b3c80
commit 1b001a2afd
75 changed files with 2169 additions and 874 deletions
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65
hotspot/src/share/vm/memory/iterator.hpp
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@ -70,8 +70,8 @@ class ExtendedOopClosure : public OopClosure {
//
// Providing default implementations of the _nv functions unfortunately
// removes the compile-time safeness, but reduces the clutter for the
// ExtendedOopClosures that don't need to walk the metadata. Currently,
// only CMS needs these.
// ExtendedOopClosures that don't need to walk the metadata.
// Currently, only CMS and G1 need these.
virtual bool do_metadata() { return do_metadata_nv(); }
bool do_metadata_v() { return do_metadata(); }
@ -126,15 +126,16 @@ class KlassToOopClosure : public KlassClosure {
_oop_closure = oop_closure;
}
public:
public:
KlassToOopClosure(OopClosure* oop_closure = NULL) : _oop_closure(oop_closure) {}
virtual void do_klass(Klass* k);
};
class CLDToOopClosure : public CLDClosure {
OopClosure* _oop_closure;
OopClosure* _oop_closure;
KlassToOopClosure _klass_closure;
bool _must_claim_cld;
bool _must_claim_cld;
public:
CLDToOopClosure(OopClosure* oop_closure, bool must_claim_cld = true) :
@ -145,6 +146,23 @@ class CLDToOopClosure : public CLDClosure {
void do_cld(ClassLoaderData* cld);
};
class CLDToKlassAndOopClosure : public CLDClosure {
friend class SharedHeap;
friend class G1CollectedHeap;
protected:
OopClosure* _oop_closure;
KlassClosure* _klass_closure;
bool _must_claim_cld;
public:
CLDToKlassAndOopClosure(KlassClosure* klass_closure,
OopClosure* oop_closure,
bool must_claim_cld) :
_oop_closure(oop_closure),
_klass_closure(klass_closure),
_must_claim_cld(must_claim_cld) {}
void do_cld(ClassLoaderData* cld);
};
// The base class for all concurrent marking closures,
// that participates in class unloading.
// It's used to proxy through the metadata to the oops defined in them.
@ -246,14 +264,26 @@ class CodeBlobClosure : public Closure {
virtual void do_code_blob(CodeBlob* cb) = 0;
};
class MarkingCodeBlobClosure : public CodeBlobClosure {
// Applies an oop closure to all ref fields in code blobs
// iterated over in an object iteration.
class CodeBlobToOopClosure : public CodeBlobClosure {
OopClosure* _cl;
bool _fix_relocations;
protected:
void do_nmethod(nmethod* nm);
public:
CodeBlobToOopClosure(OopClosure* cl, bool fix_relocations) : _cl(cl), _fix_relocations(fix_relocations) {}
virtual void do_code_blob(CodeBlob* cb);
const static bool FixRelocations = true;
};
class MarkingCodeBlobClosure : public CodeBlobToOopClosure {
public:
MarkingCodeBlobClosure(OopClosure* cl, bool fix_relocations) : CodeBlobToOopClosure(cl, fix_relocations) {}
// Called for each code blob, but at most once per unique blob.
virtual void do_newly_marked_nmethod(nmethod* nm) = 0;
virtual void do_code_blob(CodeBlob* cb);
// = { if (!nmethod(cb)->test_set_oops_do_mark()) do_newly_marked_nmethod(cb); }
class MarkScope : public StackObj {
protected:
@ -266,23 +296,6 @@ class MarkingCodeBlobClosure : public CodeBlobClosure {
};
};
// Applies an oop closure to all ref fields in code blobs
// iterated over in an object iteration.
class CodeBlobToOopClosure: public MarkingCodeBlobClosure {
OopClosure* _cl;
bool _do_marking;
public:
virtual void do_newly_marked_nmethod(nmethod* cb);
// = { cb->oops_do(_cl); }
virtual void do_code_blob(CodeBlob* cb);
// = { if (_do_marking) super::do_code_blob(cb); else cb->oops_do(_cl); }
CodeBlobToOopClosure(OopClosure* cl, bool do_marking)
: _cl(cl), _do_marking(do_marking) {}
};
// MonitorClosure is used for iterating over monitors in the monitors cache
class ObjectMonitor;